The Yuasa YTX20CH that came as original equipment in the bike in my sig has leaked sulfuric acid and corroded both terminals at less than 2000 miles on the bike. Enough to require the baking soda treatment then polishing with ultra fine emery paper.
The battery sits at a 60 deg tilt. It holds a charge just fine but once they leak they don't stop. Yuasa has refused to replace it so I'm going to put something else in on my own dime instead of running a warranty claim through the nearest Guzzi dealership that's 90 minutes drive.
That's okay with me since at time of purchase knew I'd be my own warranty for small stuff and in Moto Guzzi's defense this is not their DNA they just use Yuasa in bikes sold here, Europe they use other brand.
MrSilv04, yes, it needs the C size case to fit, I'd say it's not a mainstream fit.
I'd love a Deka or Bigcrank (both by eastern penn usa) but they don't offer anything that cross references. Interstate offers FATX20CH factory activated but they're mighty $proud$ of it and it's also several pounds heavier. Bike's ~ 600 lbs with the 8.5 gallon gas tank filled, want to keep battery at or below weight of the oem one. Every pound counts !!
All that said, it's still the only Moto Guzzi in my city that I know of and I love the thing ... great fit and finish, way fun to ride, and hardly anyone else has one. I like to have unique things, always drawn to the maverick stuff.